Two hundred kilograms (440 pounds) of methamphetamine, worth around A$200 million ($190 million), was found hidden in truck tires imported from China, Australian Federal Police announced on Friday.

The shipment arrived into Melbourne on October 1 from Shanghai, the police said.

Australian Customs and Border Protection Service Regional Director, Graham Krisohos, confirmed the seizure.

“Customs and Border Protection officers identified a concealment into Australia, consisting of a medium sized truck, destined for Melbourne,” he said at a news conference in Melbourne.

Three people were arrested, police have said. Australian Federal Police Commander Scott Lee said two of the men used to work at a Victorian wharf.

Lee went on to say that “two of the men who have been arrested were recently employed as dock workers in Victoria. This seizure is an excellent outcome for law enforcement not only here in Victoria but also nationally.”

The seizure was one of Australia’s largest multi-agency operations and involved joint waterfront task forces from Brisbane, Sydney, and Melbourne, in addition to the Sydney-based Joint Organized Crime Group and the Melbourne-based Joint Organized Crime Taskforce, police said.